Clearance angle radius dressing attachment for surface grinding machines



Sept. 7, 1943.

' CLEARANCE ANGEE RADIUS DRESSING ATTACHMENT FOR SURFACE GRINDINGMACHINES Filed Dec. 13, 1941 2 Sheets-Sheet l R T. MCQUILLAN 2,328,826

. IN VENT0 R. fiobert 11.7710 Qvu zllan/ R. T. M QUILLAN CLEARANCE ANGLERADIUS DRESSING ATTACHMENT Sept. 7, 1943.

FOR SURFACE GRINDING MACHINES Filed Dec. 13, 1941 2 Sheets-Sheet 2 4 AK1 0 9 o wmwl 39% w T Tr k f ,7 o A, 230 a e 2 9 [T9 9 m 5. $5 1 ruL v 19 2 V 2 o o 5 f? w a? 1 Q My 9 9 9 l 9 a, 6 A 7 ,6 1 ow 6 T. 2 on .1 6 1w 6, r 8\ w 1 w 2 In" 2 m MJ w 9 9 INVENTOR.

ATTORNEY Figure 4 illustrates the hinge plate 24 as being provided withfour bores 88, 90, 92 and 94. Rotation of the arm 32 may be limitedthrough I V the medium of stop pins 88, 9|, 93 and 05 respectivelyslidably disposed in the bores 90 through 94.

c To dress a concaved radius, as in Figure 13, the cutting unit 34 isadjusted to bring the cutting element 36. above the axis 42. ,If. thegrinding wheel 95 is to be provided with a concaved profile 98 in itsperipheral face having a radius;

of .25 inch, the point of the cutting element 36 is located .25 inchabove the'raxisJlZ. f V

Figure '7. illustrates the manner in which the cutting unit is adjustedto the foregoing require- .ments. A hood I00 having a pin I02 receivableelement 36 is located above the axis 42 a distance determined by thedesired radius of the profile.

In Figure 11, the tool is set for dressing the peripheral face I32 ofthe grinding wheel I36,

in which case the arm 32 is latched against oscil- I latory movement bythe pins 93 and 95 in, the

bores 92 and 94.

Figure 10 illustrates the cutting element adjusted fordre'ssing the sideface I38 of the grind- 1 ing wheel I40. In this case, the arm 32 is heldin engagement with the pin 89.

In providing a clearance angle for a radius turning toolwhich is to takethe radius, the

hinge plate .24 may be set to the desired clearance angle by means "of aprotractor and then locked in position through tightening of the pin I2.

in a bore I04 in the arm 32 is extended ,over the.

cutting unit 34. The hood is elevated to a'posiin thei'r're'spectivebores.

tion which brings its bottom face engageable with the cutting unit .250inch above the axis '42.; This position is determined by a micrometerI08'ei1gag ingFthe bottom faceof-the arm 32 and "theytop face-of thehood I00, the thickness of All the stop pins'89, BI, 93 and 95 areslidable Figure 16 illustrates the stop-pin 89 as having alongitudinalslot I40 inwardly of one end thereof to provide opposed fingers- I 32resiliently urged against the wall of the hood being predetermined sothat its bottom face may be accurately determined through'the medium ofthemicrometeri The bottom face I I0 of the arm 32 is also'constantwithrespect to v its positional relationtothe axis 42.

After the setting of the hood I0D,-the pin I02 'ismade secure by a setscrew II2 threaded into the arm 32. The cutting unitii l is thenadjusted to bring its cutting element 36 intocontact with the face I06of the hood'IIlIL When so positioned, the cutting unit 34 isfirmlysecured in position through tightening of'the setscrew 64.

After removal of the hood I00, the grinding wheel 96 of Figure 13 may bedressed to a .250

, inch concaved radius by placing the dressing tool under the grindingwheel of the surface grinder and rotating the knob 46, back and forth,which imparts oscillatory motion to-the cutting element 36 across theface of the grinding-wheel 9'6.

The cutting element 36, when viewed-according toFigure 3, is locatedvertically of the axis 42, which axis is'in parallelism with the sideedges N4 of the'base 20, which base is located so I - 1. A device of thetype described-comprising v against the rail of the magnetic chuck (notI shown) oscillating the cutting element 35' across the peripheral faceof the. grinding wheel 96, the pins 89 and 9| are projected into'thepath of the arm 32 to'limit its oscillatory motion. The arm may berotated 90 in both directions'from avertical'plane intersecting theaxis42.

Figure 14 illustrates the manipulation of the tool for grinding 'a'convexed profile H3 on the grinding wheel I20 throughout an; arcjof 180.

When grinding such a *profile,the cutting element is located .250finchbeneath the axis 42, as-

suming that the profilerl I8 isto. have a, radius of .250 inch. The stoppins 89and 9Imay be employed-when dressing the profile I I8.

In dressing a profile: I22 merging with a side face I24 and aperipheralface I26 of the grinding wheel I28, the pinsf89 and 93 are employed,

which limits oscillatory motion of the farm 32 oana gof' V. I In. Figure15, the cutting elementiifijis'located beneath theaxis 42 a distancecorresponding to theradiusof, curvature desired in the profile V Figurer12 illustrates a concaved profiled I '30 p in one side and theperipheral face margins of a grinding wheel I32." In" grinding such aprofile,

I, the pins 89 and 93 are employe'dj but the cutting limits.

the bore. In the operative'position of Figure 16, the unslotted end'ofthe pin is projectedfor engagement with the arm 32. To render the pinddinoperative, the pin is shifted to the dotted line position of Figure16. In either position,

the fingers I 32 are tensioned against the wall of the bore so as toprevent accidental shifting and loss of the pin. -All thepins' are ofthesarne construction. 4 I 1 Withoutfurther elaboration, the foregoingwill so fully illustrate my invention, that others may, by applyingcurrent knowledge readily adapt the same for use under variousconditions'of service. I

a base, an upright member pivotally connected at its lower end with thebaseand having a bore,

an arm having :a shaft'rotat ably -'mounted in said bore and 'ashoulderengaging'one face of said member, said arm having a tool carrying endrlocated laterally of the axis of rotation of I the armf'said memberbeing provided with a I plurality of-bo'res' intersecting said one faceand spaced one from the otherin the path of said shoulder when said'armis rotated about its axis, and pin means respectively slidable in saidplurality of bores to lie inwardly of said one face or to be selectivelyprojected beyond said face into the path of said shoulder to restrainthe arm from rotation beyond predetermined 1 i 2; A device of the typedescribed comprising a base, an upright'member pivotally connected atits lower end with the base andhaving a bore, an arm' having a shaftrotatably mounted in said bore'andia shoulder engaging one face of saidmember, said arm having a tool carrying end located laterally of theaxis of rotation of the arm, said member being provided with aplulimits,

v3. The invention described inclairn 2 wherein u said arm is providedwith an end groove having side walls converging toward 1 plane'ipassingthrou'ghfth'e axis of"rotation-' of-the arm; a tool Ha ing acylindrioallpody'engageable with said" body to press the latter againstsaid side faces, and means threadedly felated to said armfor clampingthe cap agains 't said cylindrical body. a (1.;T1'1E1I1Ve1'1ti0i).desoribedin olaim 2 wherein side I walls L converging toward a planepassing side faces, a capengageable witnsaid cylindrical ."through theaxis of rotation of thearmka tool slfnayingt a. oylindricalhodyuengageable with said a side faces, a eap engageablewith'saidcylindrioal A said arm is providegi'with ian erid groove having body top ress the latter against said side faces, means threadedly related tosaid arrnfor clamping the oap against said] oylin drical body, saidgroove extending transversely of the axis'of rotation of said arm, said:aim being provided with anopening having its axis paralleling thelongitudinal axis of said. groove,1and a. tool locatinghood having-apinguidably r'eceiyable in said WROBERTQIQ-I'MCQUILLAN.

